Centrifugal pump



L. A. MYERS.

CENTRIFUGAL PUMP.

APPLICATION FILED OCT. 71 1918.

1,382,665. PatentedJune 28, 1921.

INVENTOR WITNESSES zawmncelmyers iTM 95 A TTOR/VEYS PATENT OFFICE.

LAWRENCE A. MYERS, OI VISALIA, OALIFORN IA.

onnrmruon. run."

To all whom it may concern:

Be it known that I, LAWRENCE A. MYERS, a citizen ofthe United States,and a resident of Visalia, county of Tulare, and State of California,have invented certain new and centrifugal pumps, this object beingobtained by the use of a baflle plate for isolating the impeller disk orhub from the reduced pressure at the pump inlet, thereby leaving therunner to float freely in the pump case, and relieving end thrustthereon.

Another object of the invention is to provide a centrifugal pump of thecharacter described, includingas another novel feature, a self-primingvalve.

Other objects and advantages will appear 7 in the followingspecification, reference being had to the accompanying drawlng, in

which- Fi re 1 is .a longitudinal section of a oentnfugal pumpconstructed in accordance with my invention;

Fig. 2 is a face view of the runner;

Fig. 3 is a plan viewof the valve case cap; Fig. 4 is a cross section onthe line 44 of vFig. 3;

Fig. 5 is a detail view of the baflie plates stay flange, and Fig. 6 isa-longitudinal section of a centrifugal pump, showing the arrangement ofthe baflie in the closed runner.

As stated above, one of the foremost objects of the invention is toprevent the runner of the pump from being affected by the suction, thusleaving the runner free to float in the pump case and materially add tothe efiiciency of operation of the pump. One of the methods of carryingout the invention is to provide a baffle plate 1 which is fixed inposition in the pump case 2 on a baflle plate stud 3.

The stud 3 is screwed into the central hub 4 which is supported by websin the bafile plate stay flange 5. The stay flange 5 includes a bosswhich occupies the counterbore 6 in the water inlet of the pump casing.The bolts 7 which hold the stay flange 5 in position, also serve tosecure the suction pipe 8 in place on the pump case. .Thememarrangement.

' Specification of Letterl Patent. Patented June 28, 1921. Applicationfiled October 7, 1918. Serial No. 257,204

her 5 allows the water to flow freely into the pump oase,and at the sametime providesa solid mounting for the bafile plate 1.

Located behind the baflle plate 1, is the runner plate 9 of thepump-runner. The vanes or blades 10 are secured to the plate 9 in anysuitable manner, and in places be 0nd the periphery of the baflieplate 1. ach blade 10 has a boss 11, by means of which the blade portionis offset from the plate.9. The blades are thus disposed in the centralspace of the pump bowl and the provision of the-lugs forms a channelwhich is occupied by the fixed baflie plate 1.

A circular recess at one side, houses the runner plate 9. It shouldbeobserved that either an open or closed runner may be used. The plate 9may have portions out out as shown in Fig. 2 so as to create aspoke-like lllnd thrust is prevented in this pump bythe provision of thebafiie plate 1.

The bafile 1 is subject to some modification In either case the functionof thebaflle remains the same. By diverting the thrust of the wateragainst the pump runner, a great deal of. friction is avoided with theresult that a perfect balance of the runner remains durlng the operationof the pump.

The vacuum pull usually present in a pump of this kind, has no influenceon the runner because of the interposition of the baflie plate. At thesame time, the structural arrangement shown in Fig. 1 is such that novacuum is created in back of the baflle plate and at the hub of therunner, and thereby the tendency to draw in air through the bearing ofthe shaft is, not present. This feature has the added advantage ofavoidin% the use of complicated packing's.

his pump is self-priming. This is another important feature of theinvention, and comprises the use of the water supply pipe 12 which leadsfrom the outlet pipe 13 of the pump case 2 to the valve case cap 14.Here the pipe 12 communicates with a ciroular inlet port 15 in theenlargement-16 of the cap 14. The enlargement is in turn slottedtransversely at 17.

The slot 17 accommodates the tongue 18 of the check valve 19. Underrunning condi tions, the tongue 18 closes the circular port 15. Thearrangement thus rovided com- I trols the in et 20 to the suction pipe8.

primes t rises a cut-off valve automat cally actuated h the check valve,nd by this means auto-'- niiatically controlling the, flow of primingwater into the. valve chamber from a place above the ump. The checkvalve 19 con- Under; normal running conditions, the check valve 19 isunseated, and the tongue 18 which performs the functions of a cut-offvalve, occupies the slot 17 and closes the circular port 15. Waterthereforecan not flow from the pipe 12.

Should the pump for'any reason cease to operate, or lose its priming as1t 1s commonly called, the check valve 19 will drop eration .of thebaffle plate 1 have alrea y been fully brought out and are thoughtto reuire no Ztddlt-IOIlElBXPlflImtlOIIL ile the construction andarrangement" of the centrifugal pump as herein described and claimed isthat ofa generally preferred "form, obviously modifications and changesmay 'be made without departing from thev s irit of the invention or thescope of the cTaims.

I claim:

v1. A centrifugal pump, comprising a pump case having a water inlet witha counterbore, a runner operatin in the pump case and mounted on a shaftocated co-axially of said inlet, said runner comprising a runner late, aplurality of impeller blades with insi e bosses offsetting the bladesand leaving a channel adjacent to the runner plate; and means includinga baflie plate supported over the water inlet occupying said channel andisolating the runner from the reduced pressure. at the inlet, meansspannin the water inlet for rigidly supporting thei stay flan e raised,thus closing vand a suction pipe havin plate; the support of-saidbaflfle plate comprising a portion occupying and secured in thecounterbore. v a

2. A centrifugal pump, comprising a pump case having a water inlet witha coun- 'terbore, a suction pipe, and an opposite circular recess, arunner plate occupyin the circular with a pluralit of b adesllllcllldlng insi e lugs offsetting the blades in e jacent to the runnerplate; means for isolatmg the runner from the reduced pressure at theinlet includin a baflle plate occupying said channel,j'a be e plate stayflange spanmng the inlet, with a portion lodged in the pump case andproviding a channel adcounterbore and having a stud-fixedl suppgrtin thebafile plate, and means inc udin lts or securing both the suction pipean e 1n position. se f-priming centrifugal pump, comprlslng a I inletand a tangential water outlet pipe, a suction ipe secured at one endover the water i et and having a lateral openin near the other open end,a check valve wit a tongue constituting a cut-off valve, operating atsaid open end of the suction pipe; a valvecase cap closing the lateralopening and including an enlargement having a circular inlet portterminating in a transverse slot arranged to receive the tongue and thusclose said circular port, and a water supply.

pipe leading" from the pump outlet pipe to sa1d circular inlet plort, toprime the valve chamber when the c eck valve closes and the circularport is opened by the removal of the tongue.

4. A self-priming centrifugal pump com-. prising a pump casing with anoutlet pipe a water inlet, a checkvalve controlling t e water inlet, apriming water connection between the outlet pipe and the check valvechamber, and instrumentalities embodied in the check valve,

receiving 'the end of the water connection and constitutin acut-ofi-valve, said instrumentalities ena ling the o eration of thecut-off valve by the action 0 the check valve to regulate thefiow of therimin water. I LAWRENG A. YERS. Witnesses: i

'J. M. DYE, Luna Mrnns.

pump case with a central water 7

